JPH1033086A - Heating unit in water tank for fancy fish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the coolability of the controller, the operability of the temperature setter and the waterproofness, simultaneously. SOLUTION: This heating system is equipped with an AC plugs 2 which are detachably connected to a commercial power source, a temperature-setting unit 4 which is connected to the plugs 2 and sets the temperature, a heating unit 6 which watertightly houses a heater 6b, a temperature sensor 6c for detecting the temperature and a control substrate 6d for controlling the energization to the heater 6b so that the temperature detected by the sensor 6c is kept at the set value in a tightly closed case 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater device for an aquarium fish tank in which only a heater unit is installed in the water of an aquarium fish tank and the temperature of the aquarium water is heated to a temperature set by a temperature setting unit. .

[0002]

2. Description of the Related Art Conventionally, as an example of a heater device for an ornamental fish tank of this type, a device described in Japanese Utility Model Publication No. 6-24153 (hereinafter referred to as Conventional Example A) and a practical device 7-64 have been proposed.
The invention described in Japanese Patent Application Laid-Open Publication No. H10 (hereinafter referred to as Conventional Example B) is known.

In the prior art A, a heater and a temperature sensor are housed in a hermetically sealed container which is put into the water of an aquarium fish tank in a watertight manner to constitute a heater unit. On the other hand, a controller for controlling energization of the heater is provided by a water tank. It is housed inside a temperature setting unit installed outside.

In the prior art B, a controller is housed in a heater unit having a heater and a temperature sensor, and a commercial power plug is integrally provided with a temperature setting device.

[0005]

However, in the conventional example A, since the controller is built in the temperature setting unit installed outside the water tank, a heat radiating means for radiating heat of the controller is provided by the temperature setting unit. Must be provided.

However, this temperature setting unit needs to be constructed in a waterproof structure in consideration of the case where the user operates with wet hands. For this reason, it is necessary to provide a heat radiating means in this temperature setting unit while maintaining waterproofness.
If the heat radiating hole is formed, the waterproof property is reduced, and if the waterproof property is enhanced, the heat radiating property is reduced, which is not easy. If the waterproofness of the temperature setting unit is not sufficient, a malfunction such as a short circuit due to water intrusion may occur, and the user may receive an electric shock. In addition, two controllers are each addressed to the heater and the temperature sensor in the heater unit.
It must be connected with a total of four core wires, and there are many core wires,
There is a problem that a cord formed by bundling the core wires becomes thick.

On the other hand, in the prior art B, since the temperature setting device is integrally provided with a small power plug which is detachably inserted into an outlet of a commercial power supply, the power plug is increased in size or the power plug is reduced in size. When the temperature control unit is kept as it is, there is a problem that the operation unit such as an operation knob and a scale of the temperature setting device is downsized and the operability of the operation unit is reduced because the operation unit is close to the wall surface of the outlet.

The present invention has been made in view of such circumstances, and has as its object to improve the cooling performance of a controller and the operability and waterproofness of a temperature setting device for an ornamental fish. An object of the present invention is to provide a water tank heater device.

[0009]

According to the first aspect of the present invention,
A power plug removably connected to a commercial power source, a temperature setting unit electrically connected to the power plug to set a temperature, a heater, a temperature sensor for detecting the temperature, and a temperature detected by the temperature sensor. A controller that controls the energization of the heater so as to reach the temperature set value, and a heater unit that is housed in an airtight container in a hermetically sealed container and disposed in the water of the ornamental fish tank. I do.

According to the present invention, since the power plug and the temperature setting unit are formed separately, it is possible to prevent the power plug from being enlarged in size as compared with the case where both are integrally formed. Since it is not necessary to reduce the size of the temperature setting knob and the scale of the temperature setting unit, the operability in setting the temperature can be improved.

Further, since a heat-generating controller is not built in the temperature setting unit, there is no need to provide a heat radiating means in this temperature setting unit. For this reason, the waterproofness of the temperature setting unit can be easily improved. As a result, it is possible to prevent or reduce a short circuit or malfunction due to water in the temperature setting unit.

Since the controller that generates heat is accommodated in the heater unit disposed in the water of the aquarium, the cooling performance of the controller can be improved, and malfunction or damage due to overheating can be prevented.

According to a second aspect of the present invention, there is provided a controller which can be connected to the temperature setting unit with three core wires.
Since the temperature setting unit is built in a separate heater unit, the controller of the heater unit and the temperature setting unit can be connected with three cores of cords. Lightening can be achieved together.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In these figures, the same or corresponding parts are denoted by the same reference characters.

FIG. 1 is a partially cutaway longitudinal sectional view showing a heater device 1 of an ornamental fish tank according to a first embodiment of the present invention, with a part cut away and a longitudinal sectional view. In this figure, a heater device 1 for an aquarium fish tank is connected to an AC plug 2 which is a well-known power plug which is detachably inserted into an outlet of a commercial power supply (not shown) via a two-core cord 3 having two core wires. The setting unit 4 is electrically connected, and further, the heater unit 6 is electrically connected to the temperature setting unit 4 via a three-core cord 5 having three core wires.

The temperature setting unit 4 includes a rotatable temperature setting knob 4b for setting a temperature, a temperature setting scale 4c, and an on-lamp 4d such as a light emitting diode (LED) which is turned on when energized, on the outer surface of a waterproof case 4a having a waterproof structure. Are provided outside the aquarium fish tank (not shown).

The heater unit 6 is installed in the water of an aquarium for aquarium (not shown). A heater 6b, a temperature sensor 6c composed of a thermistor, etc., and a heater 6b and a temperature sensor A control board 6d, which is a controller electrically connected to 6c, is housed in a watertight manner.

FIG. 2 is a circuit diagram showing the electrical configuration of the heater device 1 for the ornamental fish tank. The temperature setting unit 4 includes an energization lighting circuit for energizing and lighting an on lamp 4d in a waterproof case 4a. A temperature setting circuit including a variable resistor 4e for changing the resistance value by rotating the temperature setting knob is housed in a watertight manner.

The temperature setting unit 4 electrically connects the two terminals on the input side to the two-core cord 3 of the AC plug 2, while the three terminals on the output side are connected to both ends of the heater 6b via a triac 6e. , And an input terminal of the control circuit 6f.

The control circuit 6f comprises, for example, a comparator of an operational amplifier. The control circuit 6f compares the detected value of the underwater temperature in the ornamental fish tank (not shown) detected by the temperature sensor 6c with the set temperature set by the temperature setting unit 4. Controlling the firing of the triac 6e so as to eliminate the deviation between the two, to control the energization of the heater 6b to on / off, and to control the temperature detection value of the temperature sensor 6c to be kept substantially constant at the temperature set value. It is. Various necessary electric and electronic elements including these are mounted on the circuit board, and the control board 6
d.

Therefore, the heater unit 6 is installed in the water of an aquarium fish tank (not shown), the temperature setting unit 4 is installed outside the aquarium tank, and the AC plug 2 is inserted into an outlet of a commercial power supply (not shown). Temperature setting unit 4
, The temperature of the aquarium water can be controlled to be substantially constant at the set temperature by the heater 6b in the heater unit 6.

Therefore, according to this embodiment, AC
Since the plug 2 and the temperature setting unit 4 are formed separately, it is possible to prevent the AC plug 2 from becoming larger than when the two 2 and 4 are integrally formed.
There is no need to reduce the size of the temperature setting knob or scale of the temperature setting unit 4 and it is not close to the wall near the outlet, so that operability when setting the temperature can be improved.

Further, since the temperature setting unit 4 does not include the control board 6d that generates heat, there is no need to provide a heat radiating means in the temperature setting unit 4. For this reason, the waterproofness of the temperature setting unit 4 can be easily improved. As a result, it is possible to prevent or reduce a short circuit or malfunction due to water infiltration into the temperature setting unit 4.

The control board 6d which generates heat
To a heater unit 6 disposed in a water tank (not shown).
Since the control board 6d is housed inside the control board 6d, it is possible to enhance the cooling performance of the control board 6d and to prevent malfunction or damage due to overheating.

Further, the control board 6d of the heater unit 6 and the temperature setting unit 4 are
Therefore, the core wire can be saved, and the cord 5 can be reduced in diameter and weight.

[0026]

As described above, the first aspect of the present invention is:
Since the power plug and the temperature setting unit are configured separately, it is possible to prevent the power plug from becoming large in size as compared with a case where both are integrated, and to set the temperature setting knob and the temperature setting unit of the temperature setting unit. Since it is not necessary to reduce the scale, the operability when setting the temperature can be improved.

Further, since a heat-generating controller is not built in the temperature setting unit, there is no need to provide heat radiating means in this temperature setting unit. For this reason, the waterproofness of the temperature setting unit can be easily improved. As a result, it is possible to prevent or reduce a short circuit or malfunction due to water in the temperature setting unit.

Since the controller that generates heat is housed in the heater unit disposed in the water of the aquarium, the cooling performance of the controller can be enhanced, and malfunction or damage due to overheating can be prevented.

According to the second aspect of the present invention, the controller of the heater unit and the temperature setting unit can be connected by three core wires, so that the core wire can be saved and the cord can be reduced in diameter and weight. it can.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a heater device for an ornamental fish tank according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of the heater device of the ornamental fish tank shown in FIG.

[Explanation of symbols]

 1 Heater device for aquarium fish tank 2 AC plug 3 2-core cord 4 Temperature setting unit 4a Waterproof case 4b Temperature setting knob 5 3-core cord 6 Heater unit 6a Sealed case 6b Heater 6c Temperature sensor 6d Control board

Claims (2)

[Claims] 1. A power supply plug detachably connected to a commercial power supply, a temperature setting unit electrically connected to the power supply plug to set a temperature, a heater, a temperature sensor for detecting a temperature, and the temperature sensor. A controller for controlling the energization of the heater so that the detected temperature becomes the temperature set value; A heater device for an aquarium fish tank. 2. The heater device for an ornamental fish tank according to claim 1, wherein a controller is electrically connected to the temperature setting section by three core wires.